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Update ScaffoldMessenger docs for MaterialBanners (#89700)

* Update scaffold messenger docs for material banners

* Typos
K
Kate Lovett committed
000f4444b8f89170f815baab47a685df6742bebe
Parent: 58944e6
Committed by GitHub <noreply@github.com> on 9/9/2021, 5:11:07 PM